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Hello everyone,
An employee contacted our IT department today. He has the following problem:
In our organization, each calendar is set so that everyone in our organization can see the free/booked times.
In Powershell it is displayed as: User: Standard (i think in english it is Default) hast the AccessRigths AvailabilityOnly
As far as I know, this is the default configuration.
However, this one employee has the problem that he cannot see the free/booked times via his Outlook 365 for almost every user. He has no problems via the browser (OWA) or the new Outlook 365 and can see the free/busy times.
Mailboxes where he has full access or calendars where he has been given separate authorizations can also be accessed with the "old" Outlook 365.
When the employee opens a calendar, it says "updating" for a very long time. At some point it then says "no connection". It doesn't matter whether the cache mode is activated or deactivated.
We have also excluded our firewall by connecting the client to Exchange Online via hotspot.
I don't have this problem with my client and my Outlook 365. If this employee logs on to my client with his user, he has the same problem. I therefore assume that it is not due to the employee's Outlook 365.
According to the M365 admin status, there is currently no problem with this.
Does anyone else have the same problem or does anyone know what the solution is for this?
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Since last thursday the issue described here is occuring in our organisation (location: Germany). Just randomly the view on colleagues' calendars is updating and it stops working shortly later. View on your own calendar is working fine. We've tested with different Outlook versions and disabled Add-Ins.
Workaround for users is switching to OWA or the new Outlook.
We reported the issue over the admin center and a few hours later Microsoft marked the problem as solved "found no issues". Problem still persists.
Regards,
Marcel
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(83.2, 86%, 18%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EBB%3C/text%3E%3C/svg%3E)
Microsoft finally confirmed an issue in the services health.
EX744850: "Some users may be unable to leverage Outlook add-ins or view Calendar free/busy information"
https://admin.microsoft.com/Adminportal/Home?#/servicehealth/:/alerts/EX744850
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EX744850 is not displayed in our Admin Center. Could you please post the content here?
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For us it is only listed in one tenant, not in our primary. The problem seems to be solved for our users. This are the informations:
Some users may be unable to leverage Outlook add-ins or view Calendar free/busy information
Issue ID: EX744850
Affected services: Exchange Online
Issue type: Advisory
Start time: Mar 19, 2024, 10:51 AM GMT+1
User impact
Users may be unable to leverage Outlook add-ins or view Calendar free/busy information.
Scope of impact
Impact is specific to users who are serviced through the affected infrastructure.
Root cause
A recent update exposed a code regression that’s leading to incorrectly rerouted traffic for Outlook add-ins and calendar free/busy information requests.
Current status
Mar 20, 2024, 1:30 AM GMT+1
We're continuing to monitor the effects of the code change within in our internal testing environment. In parallel, we're in the final steps of our validation process before deploying the aforementioned change within the affected infrastructure.
Next update by:
Wednesday, March 20, 2024 at 10:00 AM GMT+1
History of updates
Mar 19, 2024, 11:07 PM GMT+1
Upon reviewing the most recent build, we identified that it had exposed a code regression that’s leading to incorrectly rerouted traffic for Outlook add-ins and calendar free/busy information requests. We've developed and are testing a code change in order to alleviate impact. We're monitoring our internal testing environments to ensure that this code change will fully alleviate impact.
Mar 19, 2024, 8:39 PM GMT+1
We're investigating past builds to understand what has changed within the newest build to validate if this is where impact is originating. Once we can determine what introduced the impact, we'll be able to plan our steps towards the remediation of impact.
Mar 19, 2024, 7:10 PM GMT+1
We've identified the potential source of the impact and suspect that it may have something to do with a recent build. We're looking into the build to validate this theory and formulate our approach to addressing the problem.
Mar 19, 2024, 4:40 PM GMT+1
We're continuing to analyze the network trace logs to pinpoint where this impact is manifesting so we can formulate our next steps to remediate impact.
Mar 19, 2024, 2:59 PM GMT+1
We've reviewed the endpoints and requests, however, further investigation is required to help us better understand the issue, and we're analyzing network trace logs to help us achieve this.
Mar 19, 2024, 12:59 PM GMT+1
We've identified that a section of our Client Access Front End (CAFE) infrastructure is routing access requests incorrectly, resulting in impact. We're reviewing the requests and endpoints to determine the best remediation steps.
Mar 19, 2024, 10:52 AM GMT+1
We're reviewing service telemetry logs to help us determine the root cause of impact.
EX744850, Last updated: Mar 20, 2024, 1:30 AM GMT+1
Estimated start time: Mar 19, 2024, 10:51 AM GMT+1
User impact
Users may be unable to leverage Outlook add-ins or view Calendar free/busy information.
All updates
Mar 20, 2024, 1:30 AM GMT+1
Title: Some users may be unable to leverage Outlook add-ins or view Calendar free/busy information User impact: Users may be unable to leverage Outlook add-ins or view Calendar free/busy information. Current status: We're continuing to monitor the effects of the code change within in our internal testing environment. In parallel, we're in the final steps of our validation process before deploying the aforementioned change within the affected infrastructure. Scope of impact: Impact is specific to users who are serviced through the affected infrastructure. Root cause: A recent update exposed a code regression that’s leading to incorrectly rerouted traffic for Outlook add-ins and calendar free/busy information requests. Next update by: Wednesday, March 20, 2024 at 10:00 AM GMT+1
EX744850, Zuletzt aktualisiert: 20. März 2024, 09:59 MEZ
Startzeit: 10. März 2024, 18:00 MEZ, Endzeit: 20. März 2024, 09:54 MEZ
Status
Dienst wiederhergestellt
20. März 2024, 09:55 MEZ
Title: Some users may have been unable to leverage Outlook add-ins or view Calendar free/busy information
User impact: Users may have been unable to leverage Outlook add-ins or view Calendar free/busy information.
Final status: We've successfully deployed the aforementioned change within the affected infrastructure and after a period of monitoring confirmed that issue is no longer occurring.
Scope of impact: Impact was specific to users who were serviced through the affected infrastructure.
Start time: Sunday, March 10, 2024 at 6:00 PM GMT+1
End time: Wednesday, March 20, 2024 at 4:00 AM GMT+1
Root cause: A recent update exposed a code regression that was leading to incorrectly rerouted traffic for Outlook add-ins and calendar free/busy information requests.
Next steps: - We're reviewing our update procedures to better identify similar issues during our development and testing cycles.
This is the final update for the event.
EX744850 fixed the Problem for us.
Yes it is fixed for us as well. Finally :)
We're experiencing a similar temporary issue for our users. Additionally, we're encountering problems with our signature solution, Exclaimer. I suspect it might be related to the same error outlined here: https://status.codetwo.com/?subscription_confirmed=true.
If our signatures aren't loading, we're also experiencing issues with the calendar and elsewhere.
Are all of you based in Germany?
Best regards,
Frank
Yes, I am from Germany.
Most of our users who have the issue are not based in Germany. My impression was it happens mainly in UK
The employee with the problem still has the problem.
I ran the test with him today on the test client. As I reported before, it worked for a short time on the test client. However, it did not work again today on the same device.
This means that I do not assume that it is related to the device or the Office version, but is a global error at Microsoft. I created a ticket about this last week. Unfortunately, the support quality is not the best and the colleague was unable to help and moved the ticket to another department. I am waiting for feedback and will report back when I have news.
Best regards,
Max
Since last thursday the issue described here is occuring in our organisation (location: Germany). Just randomly the view on colleagues' calendars is updating and it stops working shortly later. View on your own calendar is working fine. We've tested with different Outlook versions and disabled Add-Ins.
Workaround for users is switching to OWA or the new Outlook.
We reported the issue over the admin center and a few hours later Microsoft marked the problem as solved "found no issues". Problem still persists.
Regards,
Marcel
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(92.8, 80%, 18%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EHM%3C/text%3E%3C/svg%3E)
we are facing exactly the same issue.
I opened also a thread on reddit:
https://www.reddit.com/r/Outlook/comments/1bhncoy/outlook_not_showing_freebusy_on_calendar/
and raised now a ticket to Microsoft... let's see if and how they are going to fix it